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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119485 91177308-0d34-0410-b5e6-96231b3b80d8
213 lines
6.1 KiB
C++
213 lines
6.1 KiB
C++
//===-- PTXAsmPrinter.cpp - PTX LLVM assembly writer ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to PTX assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "ptx-asm-printer"
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#include "PTX.h"
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#include "PTXMachineFunctionInfo.h"
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#include "PTXTargetMachine.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class PTXAsmPrinter : public AsmPrinter {
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public:
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explicit PTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
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: AsmPrinter(TM, Streamer) {}
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const char *getPassName() const { return "PTX Assembly Printer"; }
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virtual bool runOnMachineFunction(MachineFunction &MF);
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virtual void EmitFunctionBodyStart();
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virtual void EmitFunctionBodyEnd() { OutStreamer.EmitRawText(Twine("}")); }
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virtual void EmitInstruction(const MachineInstr *MI);
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
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// autogen'd.
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void printInstruction(const MachineInstr *MI, raw_ostream &OS);
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static const char *getRegisterName(unsigned RegNo);
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private:
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void EmitFunctionDeclaration();
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}; // class PTXAsmPrinter
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} // namespace
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static const char PARAM_PREFIX[] = "__param_";
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static const char *getRegisterTypeName(unsigned RegNo){
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#define TEST_REGCLS(cls, clsstr) \
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if (PTX::cls ## RegisterClass->contains(RegNo)) return # clsstr;
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TEST_REGCLS(RRegs32, s32);
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TEST_REGCLS(Preds, pred);
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#undef TEST_REGCLS
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llvm_unreachable("Not in any register class!");
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return NULL;
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}
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static const char *getInstructionTypeName(const MachineInstr *MI)
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{
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for (int i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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if (MO.getType() == MachineOperand::MO_Register)
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return getRegisterTypeName(MO.getReg());
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}
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llvm_unreachable("No reg operand found in instruction!");
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return NULL;
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}
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bool PTXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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SetupMachineFunction(MF);
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EmitFunctionDeclaration();
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EmitFunctionBody();
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return false;
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}
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void PTXAsmPrinter::EmitFunctionBodyStart() {
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OutStreamer.EmitRawText(Twine("{"));
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const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
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// Print local variable definition
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for (PTXMachineFunctionInfo::reg_iterator
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i = MFI->localVarRegBegin(), e = MFI->localVarRegEnd(); i != e; ++ i) {
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unsigned reg = *i;
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std::string def = "\t.reg .";
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def += getRegisterTypeName(reg);
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def += ' ';
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def += getRegisterName(reg);
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def += ';';
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OutStreamer.EmitRawText(Twine(def));
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}
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}
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void PTXAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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SmallString<128> sstr;
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raw_svector_ostream OS(sstr);
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printInstruction(MI, OS);
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OS << ';';
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// Replace "%type" if found
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StringRef strref = OS.str();
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size_t pos;
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if ((pos = strref.find("%type")) == StringRef::npos) {
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OutStreamer.EmitRawText(strref);
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return;
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}
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std::string str = strref;
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str.replace(pos, /*strlen("%type")==*/5, getInstructionTypeName(MI));
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OutStreamer.EmitRawText(StringRef(str));
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}
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void PTXAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
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raw_ostream &OS) {
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const MachineOperand &MO = MI->getOperand(opNum);
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switch (MO.getType()) {
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default:
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llvm_unreachable("<unknown operand type>");
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break;
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case MachineOperand::MO_Register:
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OS << getRegisterName(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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OS << (int) MO.getImm();
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break;
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}
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}
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void PTXAsmPrinter::EmitFunctionDeclaration() {
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// The function label could have already been emitted if two symbols end up
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// conflicting due to asm renaming. Detect this and emit an error.
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if (!CurrentFnSym->isUndefined()) {
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report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
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"' label emitted multiple times to assembly file");
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return;
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}
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const PTXMachineFunctionInfo *MFI = MF->getInfo<PTXMachineFunctionInfo>();
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const bool isKernel = MFI->isKernel();
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unsigned reg;
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std::string decl = isKernel ? ".entry" : ".func";
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// Print return register
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reg = MFI->retReg();
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if (!isKernel && reg != PTX::NoRegister) {
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decl += " (.reg ."; // FIXME: could it return in .param space?
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decl += getRegisterTypeName(reg);
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decl += " ";
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decl += getRegisterName(reg);
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decl += ")";
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}
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// Print function name
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decl += " ";
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decl += CurrentFnSym->getName().str();
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// Print parameter list
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if (!MFI->argRegEmpty()) {
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decl += " (";
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if (isKernel) {
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for (int i = 0, e = MFI->getNumArg(); i != e; ++i) {
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if (i != 0)
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decl += ", ";
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decl += ".param .s32 "; // TODO: param's type
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decl += PARAM_PREFIX;
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decl += utostr(i + 1);
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}
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} else {
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for (PTXMachineFunctionInfo::reg_iterator
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i = MFI->argRegBegin(), e = MFI->argRegEnd(), b = i; i != e; ++i) {
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reg = *i;
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assert(reg != PTX::NoRegister && "Not a valid register!");
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if (i != b)
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decl += ", ";
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decl += ".reg .";
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decl += getRegisterTypeName(reg);
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decl += " ";
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decl += getRegisterName(reg);
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}
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}
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decl += ")";
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}
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OutStreamer.EmitRawText(Twine(decl));
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}
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#include "PTXGenAsmWriter.inc"
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// Force static initialization.
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extern "C" void LLVMInitializePTXAsmPrinter() {
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RegisterAsmPrinter<PTXAsmPrinter> X(ThePTXTarget);
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}
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